Automatic telephone system



G. A. YANOCHOWSKL AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED JUNE 6.1918.

1 ,423 898, Patented July 25, 192 2,

3 SHEEI S-SHEET IE G. A. YANOCHOWSKI.

AUTOMATIC TELEPHONE SYSTEM. APPLICATION FILED JUNE 6,1918.

1,423,898. Patented July 25, 1922.

3 SHEETS-SHEET 2- Tnueuinf:

G. A. YANOCHOWSKI.

AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED JUNE 6.191s.

1,423,898, I I Patented July 25, 1922.

3 SHEETS-SHEET 3.

277177527 027 fieflrgefiifinadmwski Efi'arney.

barren stares PATENT crews.

GEORGE A; YAnocnowsK -or cnxcneo, runners, Assmnon T-O KELLOGG. swi'rcn- Beam) AND SUPPLY COMPANY-,xOF CHICAGO, inmnors, Acoarcisnrrolv .OF ILLI- NOIS.

. AUTOMATIC TELEPHONE SYSTEM.

Specification of. Letters Patent. Patgntgdfl ly25 .1 922 Application filed June 6,1918. Serial No. 238,461.

T 0 all whom it may concern:

yBe it known, that I, GEORGE A. YAN0 CHOWSKI, a citizen of the United States of America, residing at Chicag 'in the county of Cook and State of. Illinois, haveinvented certain .new and useful Improvements in Automatic Telephone Systems, of which the following is a specification.

My invention relates to telephone ex-' change systems of the kind in which auto :matic switches are employed in the exchange or central oflice forestabhshlng connectionsbetween subscribers lines, and relatesmore particularly to supervisory apparatus and registering and recording. mechanism for use in such systems.

I have found that. one of the common complaintsmade by the subscribers of an automatic telephone system is that they frequently obtain wrong numbers in calling,

that is, they do not. get the numbers that they call. In a commercial system, these complaints are generally made by the sub scriber to a so-called. complaint operator who in turn transmits them to a man who supervises the automatic switches. This supervisor then tries to locate the trouble that the subscriber has had in attemptingto put through a connection, and in great,

many of these instances the supervisor is unable to find any trouble whatsoever.

T his is due to various reasons, but is mainly due tothe fact that onfthe test made by the su ervisor the call nes throu h other make complaints that they are unable to establish connections. than other subscribers. It is one of the objectsof my nvention/to prcvidemeans that can readily be associated .with the line of anysubscriber, from whom great many complaints are received, to

- supervise the calls thatthe subscriber makes. WV1th-my device, I-am able to-recordthe exact number that the subscriber has called and. to-record each call that the subscriber makes so 'thatthe attendant or the supervisor of the automatic apparatus .mav immediately tell, upon receiving a complaint from a subscriber whose line is equipped withone of the devices, whether the trouble which the subscriber complains of is due to the subscribers error'in calling the number of'the-party that he'desir'ed to converse with, or whether ith'eautomatic apparatus at the central exchange or the subscribers callingdevice is at fault.

My device may also be used as a record ing device to record the numbers called by a subscriber so-that-toll may be assessed against the subscrlber for the number of calls made or for the subscribers called, provided. that lillQI'GJS a diitlerencein' the toll assessed for subscribers whose numbers begin with a certa-in digitand those whose numbers begin with another digit. For example, it may bethat trunks leading from a certain level of either the first, second or third selectors lead to a distant exchange which may be a nearby'town. y recording device would immediately show all calls made to that exchange, and a. subscriber could accordingly be assessed toll for these calls.

Mydevice may also be attached to a trunk and placed before an operator. In a system of this kind, the subscriber in making 7 a call jcauses his line to be connected to a trunk having one of these devices'connected thereto. He thendialsthe'desired number, causing the! same. to appear upon the registering device. The operator then completes the connection to the called subscriber whose number corresponds with the number appearing upon the registering device. The

"above and otherxfeatures of my invention will be hereinafter described, in the ensuing specification and will be more aarticularly pointed outfinfithe appended claims.

"For abetter'understandingof my invIention, reference maybe had to the accompanying drawings forming. a part of this application; i

"Fig. 1, comprising parts 1 and 2, diagramv maticallyillustrates the complete circuit arrangement necessary for connecting acalling subscriber to called subscriber in an eX- change system provided with the device of my invention;

Fig. 2 shows the top view of themechanical arrangement of the device of my inven tion. Certain of the parts are omitted to more clearly show the apparatus.

Fig. 3 is an elevation of the device shown in Fig. 2, omitting certain parts andshowin certain parts in section and *ig. 4; shows a circuit changing switch which will be hereinafter more fully described.

Referring to Fig. 1, parts 1 and 2, this circuit represents diagrammatically a calling substation A which terminates in an individual line switch B, which line switch B is adapted to connect with an idle first selector C. The first selector C is, in turn, adapt ed to connect with the idle connector D, and the connector D is adapted to connect with the terminals of the called substation E. The

called substation E terminates at the central exchange in an individual line switch B. At X, I show diagrammatically the control-- ling relays and circuits for the device of my invention. The mechanical parts of this device, as before mentioned, are illustrated in Figs. 2 and 3.

The substation A includes the usual talk ing equipment of a common battery telephone with the addition of a calling device subscribers line circuit.

the continuity of the The circuit for the subscribers substation A will be carried through a series of continuations, finally es tablishing connection with a called sub 31) adapted to break scribers telephone as E.

The line switch B is provided with s rotary shaft and carries a prii'ate test wiper 2 and a pair of line wipers 3 and 4-. A. line relay LR is provided which is energized over the subscribers line conductors in series. A cut-off relay CO is also provided for disconnecting the subscribersline circuit from the line relay LR and for connecting the switch wipers to the'subscribefls line circuit. A motor magnet 9 is provided for stepping the switch wipers 2, 3 and at step by step over the bank contacts 5, G and 7. An oft-normal switch ON is provided which is actuated upon the first step of the wipers off no mal. The switch wipers are spring restored a--d are adapted to be released to normal when the cut-off relay CO is deenergized For a more complete understanding of the struc ture ofthe line switch, reference may be had to H. H. Ide application S. N. 175,364, filed June 18, 1917, or lde application S. N. 271,960, filed January 20, 1919. y

The registering device X, as diagrammatically illustrated in Fig. 1, part 1, includes drivingma-gnets 300, 301,- 302 and 303, a combined printing and release solenoid 319, and a circuit controlling wiper 305, controlled. by a slow-acting relay 306. A quick acting line relay 304 and aslow-acting relay 299 are provided for controlling the device A; fuller description of the mechanical arrangement of the registering device X and the circuit arrangement of the same will be hereinafter given.

The circuits shown for the selector C and connector D are adapted to work with a switch structure similar to that shown in ap plication Serial No. 175.364, filed June 18, 1917, by H. H. Ide. It is to be understood, however, that the circuits shown may be used in connection with various other switch structures of the prior art.

The first selector C comprises an impulse relay IR, which relay is energized and de energized by impulses from the calling device CD at the calling substation A, and the energization and de-energization of the relay IR brings about the actuation of the primary magnet PM to step the first selector switch wipers 36, 37 and 33 in a primary direction to a certain group of contacts. A secondary magnet SM is provided for said selector which automatically steps the wipers 36, 37

and 38 in a secondary direction over the contacts 17, i8 and 49 in the selected group to seek an idle set of contacts leading to a connector, as D. A switching relay T is also provided which, when energized, extends the connection of the calling substation A. to the idle connector D. Primary and secondary off-normal contacts FUN and SON, respectively, are provided. The said primary off normal contacts PON assume their alternate position on the first. step of the wipers in a primary direction, and the secondary offnormal contacts SON assume their alternate position upon the first step of the wipers in a secondary direction.

The connector switch D is provided with an impulse relay IR. responsive to the impulses of the calling device CD at the calling substation A, which relay IR brings about the actuation of the primary magnet PM to 3 step the connector switch wipers 63. 64: and in a primary direction to a certain group of contacts containing contacts ot the called line E. A switching relay SW is provided which energizes upon the termination of the first set of impulses to connect the secondary magnet SM in circuit with contacts of im pulse relay IE, to be actuated by the energization and the de-energization thereof to step the connector switch wipers 63, 6 1- and 65 over the contacts 78, 7 9 and 80 in the selected group to seek the contacts of the called line. .A. test control relay T GR is provided which assists in the test of the called line as to its idle or busy condition, and a test relay TB is provided which is actuated upon connection with abusy called line through the agency of the relay TCR. The said relay TR operates to connect busy-back apparatus BB to the calling subscriber to notify the said subscriber of the busy condition of the called line and disconnects the relay TCR from the test wiper 63. A ringing trip relay HT. is also shown which is operated when a subscriber remove his receiver during either a ringing or a silent period, the ringing current is immediately disconnected, as will be more fully hereinafter "described. The relay ET is provided with a locking winding to prevent a reapplication of ringing current to the called subscribers line prior to a dis connection of the connector D from the line of the calledsubscriber. iVith this ringing arrangement, it is only necessary to provide one control relay for the ringing current. A

back bridge or supervisoryrelay SR is also provided which operates upon the actuation of the ringing trip relay RT. Primary and secondary off-normal contacts PO and SON are provided and assume their alter nate positions, respectively upon the pri-' imary and secondary movements of the Iw1pers 63, 6 1 and 65.

' To the right ofthe drawing, in part 2, I

show a called substation E, similar to that of A, the said subscriber being provided with a line switch B, similar to line switch 13.

In Figs. 2 and 3 is shown, to a certain extent diagrammatically, the preferred form for the mechanism of the registering device X shown in Fig.1, part 1. A mounting plate 309 is provided with side pieces 310 and 311 to form a frame for supporting the different pieces of apparatus of the device. The stepping magnets 300, 301, 302' and 30 3 are suitably supported' on a shelf extending across between the side plates 310 and 311. One of these magnets. is provided for each digit of the called number, called by the calling subscriber. I have only shown four such mag nets, but the system is arranged so that if any of the called numbers has more than four digits, it would only be necessary to provide more than four stepping magnets. The mechanism X may be constructed structurally with the individual line switch B, or

may be builtstructurally independent of the mechanism of the lineswitch B, but so arranged that it can-be electr cally connected with the line switch B. if it is desired to provide the calling s ubscriber witha registering device.

[A plurality of type wheels are mounted on a shaft 312,. properly journalled in the side plates 310 and 311. The type wheel 313 is provided with ratchet teeth 314 for engagemerit by the driving pawl 315 of the magnet 303. A'spring 316, one end of which is attaohed to the shaft3l2and the other end to third type wheels.

a pin 317 of the type wheel 313, is provided for retaining the type wheel 313 in its normal position. The periphery or the face 318 of the type wheel 313 is provided with type solenoid 319, etc., for any number of steps up to ten that the stepping magnet 303 may move the type wheel 313; The type wheel 320 is stepped by the stepping magnet 302 in the same manner as type wheel 313 is stepped by magnet 303, and type wheel 320 is provided w th type arranged in the same manner. Type wheels 321 and 322- are advanced by steppmg magnets 301 and'300, respectively, and are arranged the same as type wheel 313. Type wheel 313 is also pro vided with a stud 323 which normally rests against a pm 323 to maintain the type-wheel 313 in its normal position. A set of ratchet teeth 32% is provided for the type wheel 313,

and a holding pawl 325, properly journalled in the plates 310 and 311, extends clear across the device and is arranged to hold each of the type wheels in its advanced position. VJ hen the pawl 325 is released, the type wheels'are all returned to normal by their return springs. The holding pawl 325, of course, extends farther into the teeth of thefirst typo wheel than it does into the teeth of the second type wheel, while the pawl 325 extends farther into the teeth of the second type wheel than it does into the teeth of the third type wheel, etc. With thisarrangement. when the first type wheel is operated the holding pawl, of course, iseir tirely removed from the teeth of the other three type wheels. '"Wh en the second type wheel is operated the holding pawl is removed from engagement the teeth of the third and fourth type wheels, but not of the first type wheel. Likewise, when the third type wheel is operated, the pawl is'removed from the teeth of the fourth type wheel, but not from the teeth of the first and second type wheels;

vidual holding pawls may be used andthe master holding pawl 325 provided for releasing the individual holding pawls. Yarious When the fourth type wheel is operatechthe pawl is not re-f moved from the teeth of the first, second and If it is :desired, iiiditypes of well-known registers may be used c in conjunction with applicants invention.

The device also includes a suitable. pivoted feed spool 326', carry ng a supply of inked ribbon 327 which maybe of paper in; alter nate layers, and a receiving spool 328 to which is fastened a ratchet 329 which operates to wind the ribbon oil the feeding spool onto the receiving spool, through the action of pawl 330 which is pivotally attached to the armature 331 of the solenoid 319. The attraction of said armature serves to place the pawl 330 in a posit-ion to engage the next tooth on ratchet 329 so that upon the retraction of armature 331, pawl 330 rotates ratchet 329 and spool 328 one step. The solenoid 319 is suitably supported by cross bar 332. Attached to the plunger 333 of the solenoid is a cross bar 334 which extends across above the ribbon 327, immediately above the portion of the type wheels 313, 320, 321 and 322 which carries the printing type, and when the plunger of the solenoid is moved downwardly the bar 334 is effective to give a blow upon the portion of the ribbon immediately below the bar and above the numbers on the type wheels that have been turned around until they are immediately below the bar, printing upon the record ribbon 327 whatever numbers appear upon the curved type faces of the type wheels. A curved pawl 334' is pivotally attached to the armature 331 of the solenoid and is provided with a hooked end portion 335 for cooperation with a pin 336 carried by the re taining pawl 325. VJhen the solenoid is energized, the hooked. end portion 335 of. the pawl 334" is moved into a position so that when the solenoid is de-energized it will cause the holding pawl. 325 to disengage the teeth of the printing wheels, permitting them to return to normal, and upon. further restoration or" the armature of the solenoid, a pin 337 co-operates with the surface of the cam 338 carried by the pawl 334 to release the hooked portion 335 of the pawl 334 from engagement with. the pin 336 of the pawl 325.

In Fig. 4, I show a circuit controlling wiper 305 adapted to co-operate with the bank contacts 340, 341, 342 and 343. A ratchet 344 is provided, and a stepping magnet 306 is provided with a pawl 345 for cooperation with the ratchet 344 in moving the wiper 305 over the bank contacts 340 to 343, inclusive. A retaining pawl 346 is provided for maintaining the wiper 305 in its various positions. A coiled spring 370 is also provided for returning the wiper 305 to its normal position. The retaining pawl 346 is connected by a connecting link (not shown) to the armature 331 of the solenoid 319 in such a manner that upon the release of the armature 331 of the solenoid, the holding pawl 346 is operated to permit the wiper 305 to restore to normal. This is done in much the same manner as explained in connection with the pawl 334 attached to the armature 331. The wiper 305 controls the circuits of the stepping magnets 300 to 303, inclusive.

If it is desired, the ratchet 344 can be mounted on shaft 312 and if this isdone then the iolding pawl 334 can be made use of to retain the wiper 305 in advanced position.

Having described in general the apparatus embodying my invention, I will now describe more in detail the operation of the system as illustrated. Assuming now, for instance, that a call is to be traced from the calling substation A to the called substation E, upon the removal of the receiver by the subscriber at the substation A, a circuit for the line relay LR of the individual line switch B is established, this circuit being traced from battery through the winding of relay LR, normal contact 8 of relay 9, normal contact 10 of the off-normal switch ON, normal contact 11 of relay CO, and through the closed contacts of the switch hook at substation A to ground at normal contact 12 of relay CO. The line relay LR,upon energization, establishes an energizing circuit tor the relay 9, which may be traced from battery through the winding of said relay 9, normal contact 13 of said relay 9, and alternate contact 14 of relay LR to ground. Relay 9 upon energizing opens the circuit of relay LR at its contact 8 and rotates the switch shaft and its wipers one step. A further result due to the energization ofrelay 9 is the opening of its own circuit at its contact 13 as well as at contact 14 of relay LR. Upon the first step of the switch shaft, the ofhnormal contacts ON assume their alternate position, and contacts 15 and 16 are also moved to their alternate position, The opening of alternate contact 14;of line relay LR- brings about the de-energization of the relay 9, and should the private wiper 2 of the line switch B engage a busy contact 5, upon the first step of the wipers a substitute circuit for the line relay LR is established, traced from battery through the winding of relay LR, normal contact 8 of relay 9, alternate contact 10 of cit-normal contacts ON, and alternatev contact 16to' ground at the busy contact 5 engaged by private wiper 2. The closure of the alternate contact 14 of the line relay LR again establishes a circuit for relay 9, as previously described, causing the switch wipers to take another step and engage the second, set of contacts 5, 6 and 7. If the next private contact- 5 is busy, relay 9 and line'relay LR are again energized and de'energized to step the wipers 2, 3 and 4 step by step until an idle private contact 5 is encountered. When the contacts leading to an idle first selector C have been found, the line relay LR de-energizes, bringing about the de-energiza-tion of the magnet 9. The closing of normal contact 17 of relay LR establishes an energizing circuit for the cut-0E relay CO traced from battery through the winding of the said relay CO, conductor 18 and normal contact 17. of, relay LR to ground atalternate contact 15. The. energization of the relay CO brings about the restoration of the contacts 15 and 16 to their normal. position, opening the initial energizing circuit of the relay ()0. The relay CO, being slow to release, has a substitute circuit established for it,: as will be presently described, before it has had time to ole-energize and permit its contacts to return to normal. The relay (JO 'is 'adjusted not to pull upv until relay LR ClQ-GILQI glZES and a steady flow of current is established through the winding of relay CO. The relay CU does not respond to the pulsations of current which it receives by the rapid energization and de-energization of relayLR, buti only energizes when it re-- ceives a steady'flow of current. The ener gizationof relay C0 restores contacts 15 and 16 to normal. The wipers 37a'nd 4 having engaged contacts 6Vantl 7 oi the idle first selector C1 bring about the energization oi the impulse relaylR- of the said first selector C over a circuit traced from battery throughtheright hand winding-of the relay IR, conductor 19, normal contact20 of the relay VYT, bank contact 6, wiper 3, alternate contact 12 of relay CO, through the substationgand back through alternate contact ll 25, and through alternatecontact 23' of relay IR to ground at normal contact 26 of prlmary off-normal contacts PON. An energiz ng circuit for the relay 27 is also established when relay IR is energized, over a circuit traced from battery through the upper inding of the said relay 27, over conductor '25, and-through alternate contacts 23 of relay IR to groundat normal. contact 26. The closing of alternate contact 28 oirelay 27 establishes a substitute circuit for the cut-off relay C0 of the line switch B before it has had time to de-energize, said circuit being traced from battery through the winding of the: relay CO, conductor 18, normal. contact 17 of relay' LR, normal contact 15, alternate contact 29 of relay CO1, conductor 30, wiper 2, contact 5, conductor 31, and alternate contact 32 of relay 2- to ground at. alternate contact 28 of relay 2?, thus main taining the relay Ci) of the switch B continuously energized until the conversation is terminated. v

"The relayBO upon energizing closes its alternate contact 360, thereby closing a circult for slowea'cting relay299,this circuit extendingfrom battery through the winding of said relay 299, and'through alternate contact 3500i, relay 80stto ground. .Relay 299 upon energizing,prepares circuits for slow acting relay 306" and driving magnet 300 of the, re storing device. Thedriving magnet 300 isQop 'ei-ated responsive tothe first digit of the called number. The driving magnet S'Jitis operatedresponsive to the impulses sent-for the second digitof the called number. Thedriving' magnet 302 is operated responsive to the impulses sent for the third digit of the called number, and driving magnet 303 is operated responsive tothe impulses sent; for the fourth'digit of the called numbenjifthere'happens to be a fourth digitin the called number.

"The idle. first selector C, having been selectedby th ejgline switch B, the subscriber at the calling. substationA nowv actuates his calling device to, call the first 'digitof the called number. Assuming that the number or the subscriber of thecalleol substa' tion is345,jthe subscriber at su-b st-ationA actuates the calling device CD to send three impulses of current oven the line, Which: impulses bring about three successive deenergizations and energizationsof the impulse relay IR and of relay30t. Upon thefirst d e-energization of the impulse relay IR, the circuit for the primary magnet PM is established traced from battery through the winding of the magnetPM, normal contact. 3'3 of the secondary elf-normal contacts SON, conductor 3%, normal cont-act23, and conductor 25, to groundat alternate contact 35 of relay, 24. "'Theprimary magnet PM is energized andrle-ener gized three times, due to the opening and closing of contact 23 of relay IR, which magnet operates to step the wipersfim 37 and 38 ofthefirstselector C in a primary direction to the third group of contacts corresponding, Withthe desired second selector or connector. After the last impulse, the differential relay 27 de -enerlgizes, due to a circut being'closed through the lower winding of the relay'27, traced from battery througlrthe'lower winding of the said relay, normal contact 39 of relay SH, alternate contact Oot-relay IR, and

alternate contacts 11 and26 of primary off- I normal contacts'PON to ground. The said primary oitmormal contacts PON move to their alternate positions upon the first step or .tlie wipers of the first selector C. The energizing circuit for relay 27 ,just mentioned is closed'upon the first step of the wipers off normal, butt-he relay, 27does not de-energize duringthe sending of impulses, due to the construction and adjustment of thesaid relay 2?. The diite'rential relay 27 7 only receives'short impulses of current-during the operation of relay IR which do not affect the relay sufliciently to cause it to deenergize. As soon as the above-mentioned circuit through the lower winding of relay 27 is closed and receives a steady flow of current, the said differential relay 27 deenergizes. The opening of contact 28 of relay 27 disconnects ground from conductor 31 at this point but a substitute ground through alternate contact 26 of the primary off-normal contacts PON is substituted be fore said relay 27 deenergizes. The ground over conductor 81 also places a busy potential upon private contact 5, preventing any other individual line'switch from engaging iultiples of said contact. Owing to the construction and adjustment of differential relay 24, it is not de -energized during the rapid operation of relay IR. Upon the deenergization of the relay 27, an energizin circuit for the relay 42 is established, traced from battery through the winding of the said relay 42, normal contact 43 of relay T, normal contact 44 of secondary magnet SM, normal contact 45 of the secondary off-normal cont-act SON, normal contact 28 of relay 27, and alternate contact 32 of relay 24 to ground at alternate contact 26 of primary oii-normal contacts PON.

The energization of the relay 42 establishes an energizing circuit for the secondary magnet SM, traced from battery through the winding of the said magnet to ground at alternate contact 46 of relay 42. Secondary magnet SM energizes and steps the wipers 36, 37 and-3S one step in a rotary secondary direction to engage the first set of contacts 47, 48 and 49, The energization of the secondary magnet SM brfingsabout the restoration of the relay 42 due to the openin of normal contact 44 or said magnetSh i The opening of contact 89 of magnetSM again permits the energization of relay 27 by opening the circuit of its lower winding. The restoration of the relay 42 opens its alternate contact 46,- bringing about the res toration of the secondary magnet SM. Upon the first step of the wipers 36, 37 and 38, the secondary off-normal contacts SON assume their alternate position, and the opening of the normal contact 45 of secondary oftnormal contacts SON removes the initial ground from the relay 42; and should the private Wiper 36 of the first selector C engage a contact leading to a busy connector D, an energizing circuit for the relay 42 is again establisned over a circuit traced from battery through the winding of the relay 42, normal contact 43 of relay T, normal contact 44 of magnet SM, alternate contact 50 of relay 24, alternate contact 51 of relay 27 and wiper 36 to the grounded busy contact 47. The closing of the alternate contact 46 of relay42 brings about the energizetion of secondary magnet SM, as before described. The relay 42 and magnet SM are thus alternately energized and de-energized to step the wipers 36, 37 and 38 in a secondary direction to seelr the contacts of an idle connector switch D. hen a contact 47 leading to an idle connector as D is encountered by the wiper 36, the energizing circuit of the test relay 42 is maintained opened, thereby preventing further energizations of the secondary magnet SM. It will thus be seen that by this see-saw action of relay 42 and magnet SM a positive driving operation of the secondary magnet is secured, and that it is impossible to stop the selector C on a busy contact or to drive the said selector past an idle contact because unless relay 42 is energized, magnet SM cannot be energized, and relay 42 can only be energized when magnet SM is at normal and private Wiper 36 is resting on a busy contact.

The relay 27 does not de-energize during the secondary movement of the wipers, due to its adjustment and the rapidity of the interruptions of normal contact 59 of sec ondary magnet Sill. The closure of normal contact 39 of secondary magnet SM, after its last de-energization, closes a circuit for the lower winding of the relay 27 over a circuit previously described, and due to its differential action it de-energizes. Upon the restoration of the relay 27, an energizing circuit for the relay T is established, traced from battery through the Winding of the said relay T, alternate contact 45 of the secondary off-normal contacts SON, normal contact 28 of relay 27, alternate contact 82 of relay 24-, to ground at alternate contact of primary othnormal contacts PON. The opening of norma contacts 20 and 21 of relay T opens the energizing circuit of the impulse relay IR. The relay TR upon deenergizing, closes a circuit through the lower winding of the relay 24 traced from battery through the said lower Winding, normal contact 23 cl said relay IE, to ground at alternate contact of said relay 34. The relay 24, due to its ditlerential windings, neutralizes and restores to normal. The relay 24 restoring, opens the circuit of relay 27, permitting the said relay 27 to restore The closing of alternate contacts 20 and 2.1. of relay T extends the connection of the calling subscriber A to the idle connector D, engaged by wipers 3 6, 37 and 38 of selector C. The closing oi alternate contacts 20 and 21 of relay T brings about the energization of the impulse relay Iii oi? connector D, over a circuit traced "from ground through the right hand-winding of said relay TR, bank contact 49, wiper 38, alternate contact 21 of relay T, bank contact 7, wiper 4, alter nate contact 11 of relay CO, through the substation A, the alternate contact 12 of relay CO, wiper 3, bank contact 6, alternate contact 20kof 'relay T, wiper 37, bank contact 48, and through the left-hand winding of therelay IR to battery and ground. The

relay T of the first selector G, but the relay T being slow to release has a Substitute circu1t establlshed' for 1t, traced from battery through the winding of said relay, its -alterhate contact 52, wiper 36,-bank contact 4:7, conductor 53, and conductor 54- to ground at alternate contact 55 of the impulse relay IR before it has had time to deenergiz'e.' The said relay T remains energized until the termination of the conversation.

Returning now to the operation of the registering relay 304, this relay upon its first de-e'nergization establishes a circuit for the slow-acting relay 306, and a circuit for the driving magnet 300. The circuit for the slow-acting relay 306 extendsfrom battery through thewinding of said relay, alternate contact 361 o'frelay-299, and through normal contact 360 of relay 304 to ground. The relay 306 receives three impulses of current over this circuit during the operation of the subscribers calling device for the first digit, and remains energized during this interval; The relay 299 being slow acting,

also remains energized during the time that the relay 304 is sending impulses to relay 306 and-to the driving magnet 300. The driving magnet 300 receives three impulses of current over a circuit traced from battery, through the winding of said driv ing magnet, bank contact 3&0, wiper 305,,

alternate cont-act'36l of relay 299, and alternate contact 360 of relay 304 to ground. The

driving magnet 300 operates to rotate the I type wheel 322, rotating the wheel until the numeral appears immediately below the cross bar connected to the plunger of the solenoid. Upon the cessation of the impulses sent from the subscribers callin de- Vice for the first digit, -the relay 300 deenergizes owing to the factthat its circuit is held open at contact 360- of relay 304. The

- relay 3061fallingback steps the ratchet 3 M ahead one step throughthe medium of its pawl 345,-thereby placing the wiper 305 on the next bank contact, 3-ll,thereby associating the driving magnet 301'with the impulse contact 360. of the relay 304;. p

'lhe-ene'rgization of therelay IR" of connector D brings about the energization of the relays-56 and 57, the circuit of relay- 56 extending from battery through the righthand winding of said relay, normal contact 58 of the primary oii-normal contacts POX,

conductor 53 and conductor 54 to ground at alternate contact 55 of relay IR. The circuit for relay '57 extends from" battery through the lower winding of the relay 57, conductor 59, conductor 60, and alternate device CD to send the second 5? brings about the contact 61 of relay IE to ground at alternate contact 55 of impulse relay IR. Upon the energization of relay 56, a locking circuit is closed for the said relay 56 extending 62 to ground.

The subscriber now operates his calling" series of un pulses, which are four in number, over the line. These four impulses bring about four de-energizations and energizations of the relay IR, causing the primary magnet PM to energize and de-energiz e four times to step the w1pers63, 6 1 and 65' in a primary direction to the fourth group of contacts containing the contacts of the called line. The four impulses sent from the subscribers substation for the second digit of the called number cause the relay 30% to energize and from battery through its alternate contact 1 de-energize four times, thereby causingthe stepping magnet 301* to rotate the type wheel 321 four steps in a manner to be hereinafter describec. mary magnet PM may be traced from battery through the winding of the said magnet, normal contact 66 ol switching relay SV, conductor 67, alternate contact 68 of The circuit 01" the pi-i relay 57, normal contact 61 of relay IR,

conductor 5%, conductor 53, and normal contact 58 of the primary oil normal contacts PON to ground at alternate contact '62 of relay 56. The primaryoff-normal contacts PON assume their alternate positions upon the first step o1 the wipers off normal. The opening of the primary off-normal contact 58 substitutesthe ground fed from contact 69 of relay 70 for the contact 62 of relay 56. After the last impulse of the series has been'sent, the steady flow of current through both windings of relay 5? causes the said relay 5?, due to its diflerentialaction, to neutralize and restore Relayfi? does not restore during the sending of impulses due to' its adjustment, construction, and the rapidity of the interruptions of contact 61. contact 71 of relay its contacts to normal.

The closing of'normal energization of the switching relay SlV- traced from battery through the winding of said relay-31V,

the makebetorebreakcontact 72 ohsaid relay SW, normal contact '73 of secondary off-normal contacts SON, conductor 7a, normal contact 71 of relay 57, and conductor 75 to ground at alternate contact 76 of primary off-normal contacts PGN. the said primary off-normal contacts PQN having been moved to their alternate position on the first I step oi the wipers 63, 64 and 65- of the con nector switch D. The closing of alternate contact 85 of relay. SW closes a lOCl'IlIIg circuit for itself traced from battery through the Winding of relay SW, alternate contact 85, conductor 86, normal contact 8'7- of ground fed through relay TCR, conductor to ground at alternate contact 76 of primary oil-normal contacts PON. The said relay SW remains energized until the relay TGll is actuated, as will be presently described. The our de-energizations off the relay 30 1 01 the registering device send i our impulses of current through its back contact 369 and through slow-acting relay 306 and driving magnet 301 in multiple. Thedriving magnet 801 rotates type wheel 321 until the numeral 4 appears immediately below the bar 334 attached to the plunger of the solenoid. Upon the cessation of impulses for the second digit of the called number, the relay 306 falls back and steps the wiper 305 from bank contact 3 11 to bank contact 342', thereby preparing circuit for driving magnet 302 of the registering device which will be closed upon the following operation of the relay 304. The closing of alternate contact 66 of the switching relaySlV now renders the secondary magnet Slll operative so that when the calling subscriber at the substation A actuates his call device again to send the last set of impulses, which we have assumed are five in number, the said magnet Shl' will be energized and de-energized by the impulse relay Il live times over a circuit traced from battery through the winding of the said magnet SM, alternate contact 66 of relay SW, conductor 67, alternate contact 68 of relay 5?, normal contact 61 of relay IR", conductor 5 1-, conductor 53,alternate contact 58 of the prinniryoil normal contacts POI and conductor 77 to ground at normal contact 69 of relay 70. Relay 301 also de-energizes live times for the last digit of the called number. The secondary magnet SM now steps the wipers 63, Gel and 65 in a secondary direction to engage contacts 78, 79 and of the called line. .Upon the first impulse of the last set, that is, upon the opening oil contact 61 of relay TR, the relay 57 again energizes to permit the secondary magnet operated, and after the last impulse the relay 57 is again de-energized by having a clrcuit closed through itslower winding, as previously described. The restoration of the relay 57 closes a circuit for the relay TCR traced from battery through the winding of the said relay, conductor 81, alternate contact 82 of relay SlV, alternate contact 73 of the secondary oil-normal contacts SON, (said contacts having been moved to their alternate position upon the first step of the wipers in their secondary direction) conductor T l, normal contact 71 oi relay 5?, conductor '75, to ground at alternate contact 76 of the primary oil-normal contacts PON, thus causing the said relay TCR to energize. The relay TRC, upon energizing, opens the locking circuit of relay SQV at its contact 87, permitting the said relay to de- Shil to be energize. .The relay SW de-energizing, opens the circuit of the relay TCR at its contact 82, leaving the relay THC dependent upon the potential found on the private contact 78 of the called line. 7.

The closing of alternate contact, of relay TUB connects the test relay TB- in multiple circuit with said relay TCR to the test wiper 63, the circuit or the test relay TR being traced from battery through the winding of said relay, its make-beforebreak contact 94:, conductor 95, normal contact 82' of relay SWV, conductor 81, alternate contact 90 of relay TCR, conductor 91, normal contact 92 of relay TR, conductor 93 to S the test wiper G3. The circuit of the relay TCB may be traced from battery through the winding of the said relay, its alternate contact 90, conductor 91, normal contact 92 of relay TR and conductor 93 to the wiper 8 63. The relay 30% is de-energized five times for the last digit of the, called number, as bet'ore mentioned. The said relay de-energizing operates to close a circuit from ground through its back contact 360 to relay 306 and to driving magnet 302 in multiple. The driving magnet 802 receives five impulses over this circuit and steps its tpye wheel 320 ahead five steps until the numeral 5 appearing upon the outer periphery of the type twheel appears immediately below the cross bar illl attached to the plunger 338 of the solenoid 319. From the foregoing operation, it is apparent that driving magnets 300, 301,

and 802 have been operated to rotate the type wheels 322, 321 and 320, respectively, until the number called by the calling sub scriber appears immediately below the bar 33l of the printing solenoid 319. In the present instance, the fourth driving magnet 303 is not utilized, as the called number only has three digits.

Called line icllc.

Assuming that the called line is idle,

to find a ground upon wiper 63 returns to normal, having its initial energizing circuit opened at alternate contact 82 of relay SW, as before described.

The relay TCR de-energizing brings about. the energization of the relay 70 over a circuit traced from battery through the cutcil relay C0 of the individual line switch 13, bank contact 7 8, through wiper G3, conductor 93, normal contact 92 of relay TB, conductor 91, normal contact 900i relay TCR,-conductor 96, normal contact 97 of relay SW conductor 98, through the lower winding of the relay 70, conductor 99, to ground at alternate contact 100 of the relay 56. Relays 70 and CO energize over this circuit. Relay CO upon energizing, -removes the called subscribers c 'ontrolf o f the p I itself tracfed from batteryitlfifoughthe lower line switch 13. V

The closing or alternate contact 101 of relay T0 short-circuits the lower tyinding ot. the said relay and feeds ground to thecut;

oll' relay C0 of the line'switc h B yfand at the samemime sup,plies ,the;busy potential to the multiple private cont acts ol vthe line The closing of alternate contact of relay ,70 closes a circuit through thelupper Winding of said relay Otraced'froin batteryt through its winding, the alternate Contact 102 of said relay 70, and conductor 3m ground at alternatecontact olrelay 56.

T he closing of alternate contact 103 "ofthe relay (0 closes a circuit ,t'or r nging current from generator GR to signal flifloalledlsiibscriberfs substation, the-path of said ringing current being traced from battery through the ringing generator GR, through the live segment of the interrupter I, through the winding lOaofri nging trip relay RT, eon ductor 105 alternate contact 10.3. o;f .rel ay T0, (onductor 106, normal contact 107 of relay RT, wiper 65, contact 80,ithrough;thecall bell and condenser ofHtheQcalle d substation E, back through contact 79, Wiper,:6l normal contact 108 of relay RT andconductor 10,9, to ground at alternatecontact 69' of relay T0. The ringing current .is intermittently connected to the called linedue to 'thecoa;

stantly rotating interrupter Lithus bringing about an intermittent actuationofthef'call signal at thecalled subscriber s substation E. The interrupter l 'islso arrangedl that ringing current from the generator and battery 110 are alternately connect'ed ltolthe called line so that should the subscriber answer in either a silent or aringingperiod, ringing current is instantly disconnected, thus eliminating the undesirable feature ringing the answering subscriber at (the called substation in theear shoul d the subscriber remove his receiver during ia ringing period. During the ringing- "and silent periods, and before the subscriber at ,the called substation E answers, the condenser at the said substation prevents a fflow of battery through the Winding 1 04 ofrthe relay RT. The subscriber in response to thefoall' signal removes his rereiyer, and should he remove it duringla ringingrper odthe com-- bined generator and battery,ci1rrent of tl e generator GR and battery ]bring,about the energizationof the relay R -T oieiiacin cuit traced from battery IQSQthrougj'h/Qthe" said generator GR,through the interrupter I, the upper winding- 104 of relayiR-Tjcondu ctor 105, alternate co1 1t act 1O3 conductor 7 106,; normal contact 107, wipjerifiiand contact 80,-through the now closed contacts at the substation switch hoolsibacli through contact -79, wiper 6L4, normal contact'llo conductor 109Qto ground at alternate contact Tll r la Bi e e izes.Qve thec ust traced andc'loses .a locking c rcult'ffor a wast p raxa fa aR energize er a cii' cuitrfroin battery 1 10 h li ia of thatampta PPQI di ile hf any BT'faiid over th ip erigau lyl s bed re ihi reu id a a te ate eam 1 w i hta s sa elay .liT-tle .epef i e amus the 'lbq fi circuit roar el fithroiigh its W'indingIIII, asb eiore l f hus it be seen that r gg ng c 'reu i instan y sch eec e :n-om w ja l d' l n e he .du i or sil nt .re ieds by he armies 9 qutacts 210mm 1.0 ay R LUpbi th 'enerei a ion' of t a elayR- h ener r i'rci litfp' 'th l pe sb ry may SR is e ab ish d traced o b ttery t u h lower g mma? of said relay alternate arm $10. '0 el y RT, pere fillrei the js sbs i fl h 0 h 1 s 17 W p .6 ;jalteriiate en a of relay and through i the j upper vinding of; the relay i :g Q iid. J subscribers are IIIOW i'n 'conversatignal circuit the ily ma-r ked: conductors the said coii,d 'ictors hewr ee r ;.K"anl 1 int rp e lhe sub c ber ,h vmg" fi ishe cbii've'ratif a as' mn g tha th bsdrih l'at normal contact 43, .norfmal' 'contac't 1 1 4 of magnet SM; normal contact '50 of rela'y 24,

' r fih ie h in h /rel y and alternate contacts 4L1 and 26 fpnmar off-norrnal contacts PONto ground. The closing of alternate contact 46 of the relay 42 bringslabout the energization of these'condary' magnet SM; The relay 42 andthe V secondary'magnet SM are, alternately energized and, dee1 1ergized, as previously described, thelsecondary magnet SM thus stepping the 'wip rs'ae, 37s and as e ond the last contacts of the rogwwofb'ank contacts;

normal. The secondary pit-normal contacts f 1251' a from which pointth'e ipersfareirestoredl'to contacts PON opens the energizing circuit of the cut-off relay 0'0 ofthe individual line switch 13.. The restoration of the cutofl relay C0 of the line'switch B places the,

line switch B in a condition so that it may be used to extendsubsequent calls. subscriber E placing his receiver upon the switch hook interrupts the circuit of the relay SR of the connector D at the switch hook contacts, causing the said relay to deenergize. The closing of normal contact 130 or relaySR closes-a circuit through.

the left-hand winding of therelay 56, which may be traced from battery through the said left-hand winding of relay 56, through its alternate contact13l, conductor 132, normal contact 130, and conductor 133 to ground at normal contact 55 of the relay 1 l Due to the differential construction of the relay 56, the said relay neutralizes and restores to normal. The closing of normal contact 134 of relay 56 closes the circuit of secondary magnet SM, which may be traced from battery throu h the winding of said secondary magnet Si conductor 135, normal contact 134: of relay 56, alternate con tact 136 of primary cit-normal contacts PON, through the interrupter I to ground. The secondary magnet SM thus steps the wipers 63, 64k and 65 beyond the last set of contacts in the group, and the wipers then restore to normal from this position. The restoration of the relay 56 also brings about the opening of the circuit of the relay 7 Oat alternate contact 100, bringing about the restoration of the saidv relay 7.0., "The primary oft-normal contacts PON having re stored upon therestoration of the switch,

the opening of alternate contact 76 of the contacts PON brings about the restoration of the relay RT. The relay 56 also causes the deener gization of cut-01f relayCO of the line circuit B, which is associated with the called subscribers substation E. All of the apparatus used in establishingtheconcircuitof' relay 306 and of driving magnet 303' In this instance, relay 3'06 upon en ergi zing closes its contacts 36?, thereby preparlng a circuit for the printing solenoid 319. Relay 299, upon tie-energ zing, opens the circuit of relay 306 and of driving may}.

net 303. The relay 306, however, is slow'to tie-energize, holding its contact 307' closed momentar ly while a circuit is closed throughprint ng solenoid 319 over a path extending from battery through the'iwindii'ig The f of solenoid 319, alternate contact 30'? of relay 306, normal contact 361 of relay 299, and back contact 360 oi relay 304 to ground. This circuit is finally opened by relay 366 falling back. The falling back of relay 30% also closes a'circuit for magnet303, causing it to take one step before the number is registered. 11. it is so desired, the last type wheelwillbe so constructed that it will take two steps before the figure 1 is brought into a position to be stamped upon the tape. The solenoid 319, upon energizing, causes the'cross bar 334 attached to plunger 333 oi the solenoid to print the number called upon the paper 327. The solenoid, upon de-energizing, causes its arm 330 to turn the ratchet 329 ahead one step, thereby rotating the wheel 328 and moving the roll oil paper one step until an unused portion of the paper appears immediately below the cross bar 334 of the solenoid 319. .The arm 334 attached to the armature of the solenoid moved torward when the solenoid was energized and the hooked end portion of said arm is now immediately below the pin 336 of the pawl 325. The solenoid upon tie-energizing causes the pawl 325 to be moved from engagement with the teeth of the type wheels, thereby permitting the said type wheels to return to their normal position, and, at the same time. as before explained, the holding pawl 346 is. moved from engagement with the ratchet 34a attached to the wiper305, thereby permitting the wiper 305 to be restored to its normal position by the restoring spring 370. If the calling subscriber had only called one digit and then replaced his receiver, only that digit called would have been printed upon the paper 327. I

Assuming now that the subscriber at the called substation E is the first to replace his receiver upon the switch hook, the opening 0 l' the switch hook contacts at the substation brings about the dc-energizaticn oi the relay SR. Nothing else happens at this time as the relay IR is still maintained energized over the line of the calling substation A. The calling subscriber at the substation A. replacing his receiver interrupts the circuit of the impulse relay IR at the switch hook contacts. The relay IR de-energizing. closes a circuit through the left-hand wimling of relay 56, causing thesaid relay to de energize, as herein-before described. The restoration of the individual switch B. first selector C and connector D is the same as previously described from this point on.

Should the called subscriber E fail'to replace his receiver upon the switch hook after the conversation is terminated, the replacing of the receiver at the substation A brings about the de-energization of the impulse relay IR of connector D,'the same as before, and the opening of alternate contact 55 of theimpulse relay IR opens the circuit of the relay T of the 'first'selec'tor C, as before described, and causes the release of the selector C and individualswitch B. The subscriber at the called substation failing to replace his receiver upon the switch hook permits the continued energization of the relay SR, thus holding contact 130 of said relay in its alternate position, preventing 'the'differentially wound relay 56 from restoring to normal and closing the energizing circuit for the secondary anagnet'SM. The relay 57 energizes whenthe impulse relay IR drops'back but is immediately restored to normal due to the closure of an energizing circuit through the lower winding of the said relay 57, which may be traced from battery through the lower winding of the relay 5T, conductor 59, conductor 60, alternate contact l30, conductor 138, to ground at normal contact 55 of the now restored impulse relay IR. Therelayo'f being differentially wound restores to normal, and the closing of normal contact M0 of said relay 57 places a ground upon the private contact of the connector D over a circuit which may .be'traced from ground to alternate contact 76 of primary off-normal contacts PON, through conductor 75, normal contact 71 of relay 57, conductor Tet, alternate contacts 73,11oriual contact 1.4.0 of relay I57, alternate contact 141 of secondary off-normal contacts SON and conductor 53 to the private contact 47. The placing of the busy potential uponthe private contact prevents any first selector switch C from engaging the contacts of this busy connector. v 1

Called Zine busy.

Assuming now that thecalled line busy, the operation of the circuit is the same upto and including the time when the-relay TCR energizes, as previously described. The line being busy, private contact 78 has a busy potential placed upon it, .thus closing the multiple circuit for the'relay TCR and the test relay TR, the circuit of the relay TCR being traced from battery through the wind- 7 ductor 81, alternate contact 90 of relay TCR,

conductor91, normal contact 92 of relay TR, conductor 93 and wiper 63 to ground at busy private contact-"78. The contacts 94 and "92 of the relayTB are so adjusted that the alternate contact 1 50 makes before the con-.

tact ,92 breaks, thus closing a'locking; circuit for relayTRthrough its alternate contact 150 before the normal contact 92 or the said relay breaks. -The"locking circuit of the said relay TReXtends from battery through .the alternate contact 150 of the relay TR,

test conductor-93 is held open at contact 92 oi relay TR. The locking circuit for the test relay TB is thus independent oi the busy grounded contact 78. This arrangement does away with the inethodusually employedof lockin'gthe busy relay up to the busy private contact of the called busy line. The-closing of alternate contact 152 of relay TR 0011- nects the busy back signal BB to the calling line to transmit a busy signal to the said calling subscriber at the substation A, thus notifyinghim of the busycondition'of the said-called substation E.

The calling subscriber now replaces his receiver upon the switch hook, bringing about the de-energization of TR and olrela}. 304. The relay IR restoring opens the cir cuit for the=relayT-of firstselector C, which closes the circuit of the secondary magnet SM, as previously described, 'tllus bringing about the release of the firstselector C and individual switch B. The de-energization of the relay "304- causes the printing solenoid 319 to operate in the same manneras hereinbefore described. The relay IR de-energizing brings about'the restorationof the relay 56, due tothe fact that the relay SR is not energized. The closing of normal con tact 13a of the said relay 56 closes the circuit forthe secondary magnet SM which magnet steps the wipers 63,64 and beyond the last set of contacts. The wipers then restore to normal. Primary off-normal contacts PON and secondary off-normal contacts SON are alsorestored. The apparatus used in this busy connectionis now at normaland available for use in establishing other connections. Should the called line becomeidlc during the time ofthe transmission of. the busy signal andthe time'the calling subscriber replaces his receiver, nothing happens as the contact 92 of relay TB is in its alternate; position. preventing the energization of relay 70, and thuspreventing ringingcurrent 'fronr' being sent out tothe now idle called line.

"From'theforegoing, it isat once apparent that the-device X operates to register whatever number the calling wsubscribermay call.

Should the supervisor at the'automatic eX- change receive a complaintithat'the calling subscriber is unable to call the subscriber whose nur'nber 1s345, the supervisor would inimediate'ly go tothe-device X and ascer= t ain whether or not the calling subscriber tuaily called number 345, and in the event at he not that the number called by the calling subscriber was 335, he immediately knows that the subscriber has erred in calling, and that the automatic apparatus is not at fault. H e then instructs the callingsubscriber to recall his number and to pay particular attention to the calling of such num- However, it he finds that the calling her. SlIbSCL'liUQ/J' actually did call number 34b3, he then tests out and watches the operation of the automatic apparatus to ascertain why the calling subscriber tailed to receive the proper connection.

In the event that the calling subscriber is assessed toll for each call that he makes, it is only necessary at predetermined periods to remove the roll of paper from the device and check over the numbers called by the calling subscriber and to assess him toll accordingly.

It the device is to be used to indicate to the operator the number that the calling subscriber desires, the device is connected in a cord circuit in such a manner as to have the line relay 30d operate the device X as previously described, and at the same time to operate a signal to notify the operator that the calling subscriber desires a connection. After the device X has been operated. to register the number the calling subscriber desires, the operator then completes the connection with the called subscribers line in any desired manner.

While I have shown a system of 1,000 line capacity, it is to be understood that by inserting second selectors this system may be increased to 10,000 lines, etc.

WVhile I have described my invention operating in connection with a well-known system, I. do not wish to be limited to this exact disclosure as my invention may be applied to other systems without departing from the spirit of the invention, and I, therefore, do not wish to be limited to this exact disclosure but aim to cover all such changes and modifications as come within the spirit and scope of the appended claims.

l Vhat I claim as new and desire to secure by United States Letters Patent is:

1. A telephone system including subscribers telephone lines provided with calling devices, switching means controlled by said calling devices for interconnecting said subscribers telephone lines, and recording devices including means for automatically and permanently recording the numbers called by the calling devices.

2. A telephone system including subscribers telephone lines provided with calling devices, switching means controlled by said. calling devices for interconnecting said subscribersltelephone lines, and recording de vices for printing on a paper roll operatively associated with said devices the number of impulses in each series of impulses sent by the said calling devices the printing of the number being etieeted automatically when the calling subscriber signals for disconnection.

3. A telephone system including a calling subscribers telephone line and a called subscribers telephone line, a calling device :for said calling subscribers telephone line, automatic switching means controlled by said calling device for establishing connection between said calling subscribers line and said called subscribers line, and a recording device for automatically recording on a paper roll operatively associated with said recording device the number called by the calling subscriber in completing connection with the called subscribers line the recording of the number being effected when the calling subscriber signals for a disconnection.

4. A telephone system including a calling subscribers telephone line and a called subscribers telephone line, means for connecting said subscribers lines in telephonic com munication, a registering device, means for adjusting said registering device, said first means and said second means both being controlled by the calling subscriber simultaneously, and automatic means for making a record of the numbers displayed on said registering device.

A telephone system including a calling subscribers telephone line, a called subscribers telephone line, automatic means "for connecting said lines, a registering device, a. calling device at the substation of said calling line for controlling both said automatic means and said registering device simultaneously, and means including a solenoid magnet tor recording the operations of said registering device.

6. A. telephone system including a calling subscribefs telephone line, called subscribers lines. automatic switching means, a calling device at the calling subscribers substation "for controlling the operation of said switching means in completing connections with said called lines, and a recording device including a. solenoid magnet for making permanent records 01"? the operations of said calling device in completing said connections with said called lines.

7. a telephone system including a calling subset; iers telephone line. called subscril crs lines. automatic switching means, a calling device at the calling subscribers substation for controlling the operation of said switching means in completing connections with said called lines, and a registering derice for registeringthe numbers called by the. calling subscriber when operating said switching means to complete said connections, said switching means and said registermess mg means responsive simultaneously-to the actuation of said calling device, said registering device being provided with means operable after the connections are completed to'record the numbers called. i

" 8. A telephone systcmincluding a calling subscribers telephone line, called subscribers -teleplion'e lines, automatic switching means under the coi'itiol'ot the calling subscriber for completing connections with said called subscribers lines, and a'ii'egistering device individual to the calling subscribers .said type frames adapted to visualize the numbers shown on the type frames.

10. A telephone system including a calling subscribers telephone line, automatic switching means for extending calls from said calling line, a calling device individual to said line for sending series of impulses for operating said switching means, and a record- 'ing device for permanently and automatica ly recording each call made from said line.

11. A telephone system including a calling subscribers line provided with an individual call sending device for sending series of impulses of different digit values, and a recording device for automatically and permanently recording the digit values of the series of impulses.

12. A system of the character described a calling subscribers line, including an individual impulse sender for sending a plurality of series of impulses, and a recording device for automatically and permanently recording the digit value of each of said series of impulses.

' 13. 'A telephone system including a calling subseribers line, automatic means controlled over said calling line for extendingconnections to called subscribers lines, and a registering and recording device operable to visualize and to automatically record the numbers of the called subscribers lines to which the calling subscriber extended connections, said registering and recording device being so arranged that at any time it will disclose the prior called numbers of the subscribers.

14%. A telephone system including a calling subscribers line, called subscribers lines, means for extending connections from said callling subscribers line to said called sub- :saidcalling line, an impulse sendi-ngdevicelllCl'lVlClH-ll to said calling subscribers line scribers lines, and a device individual to Said Calling Su'bscribers line for automatically andjpermanently recordin'gthe number of each called subscribers line that connections-are: extended to from the said callingsubsci'iberos; line. 15'. A telephone system including acalling subscribefis teleplioneline, automatic switch- I ingmeans for extending connections from for. controlling the, operations of said auto matic means, and a device for recordingthe record the number called by. a calling sub,-

scriber when the calling subscribersignals for disconnection.

18. device of the character described adapted to register the number called by a calling subscriber, said device adapted to record said number automatically when the calling subscriber signals for disconnection.

19. A system of the character described including a call sending device, a plurality of type frames, means including a plurality of stepping magnets. for adjusting said type frames responsive to operations of said call sending device, and means responsive thereafter to record the operations of said type fra nes. I

20. A telephone system including a calling subscribers line and a called subscribers line, an automatic switch individualto the calling subscribers line, other automatic switches, a device at the callingsubstation for controlling said other automatic switches to extend a connection from said calling line to said called line, and a device including a operations ofzsaid impulse sending device,

fpermanently record said number when the calling subscriber replaces l1lS receiver.

22. A telephone system including a calling subscribers line and a called subscribers line, an automatic switch indivdual to the calling subscribers line, other automatic switches, a device at the calling substation for controlling said other automatic switches to extend a connection from said calling line to said called line, and a device adapted to record upon a paper tape the number called by the calling subscriber When the calling subscriber signals for disconnection.

23. A telephone system including a calling subscribers line and called subscribers lines, automatic switches controllable over the calling subscribers line for'cornpleting connections with the called subscribers lines, and a recording device individual to the callingsubscribers line for permanently recording upon a paper tape operatively associated with said recording device the numbers of the called subscribers lines called by the calling subscriber.

Signed by me at Chicago, in the county of Cook and State of Illinois, this 4th day of June, 1918.

GEORGE A. YANOCHOl/VSKI. 

